Made cereal-1.0.0 a header-only library.
Tweaked README.md.
No gflags for Cereal.
Merge pull request #6 from dkorolev/master

Linux -> Posix, added header-only gtest, removed all TODO-s.
Removed Cereal demo, left its code in 3party.
Merge pull request #7 from dkorolev/master

Removed Cereal demo, left its code in 3party.
Removed Cereal/build/demo that was left hanging there.
Merge branch 'master' into FileUploader